Time for some tests!
Shoot the subjects!

Make them all die!
If they survive!
Bake them a pie!
The time is nigh!
Testing is here!
Let out a cheer!
Please sing along!
This is our song!

For the Animal King!
We'll always sing!

Guns we will bring!
Bullets we will sling!
Fill them with holes!
That is our goal!
Test if you dare!
Are you still there?
Please sing along!
This is our song!

With joyful ring!
We're caroling!
Neurotoxin!
Is pumping in!
From everywhere!
Filling the air!
Filling the air!
Filling the air!

Oh how they pound!
Raising the sound!
Throughout Aperture!
GLaDOS is here!

Merry, merry, merry, merry science!
Merry, merry, merry, merry science!

Testing all year!
With Christmas cheer!
We'll only stop!
When subjects drop!

[INTERMISSION]

With joyful ring!
We're caroling!
Neurotoxin!
Is pumping in!
From everywhere!
Filling the air!
Filling the air!
Filling the air!

Oh how they pound!
Raising the sound!
Throughout Aperture!
GLaDOS is here!
Merry, merry, merry, merry science!
Merry, merry, merry, merry science!

Testing all year!
With Christmas cheer!
We'll only break!
For tasty cake!

[TURRET SOLO]

That is our song!